/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.segment.spi.memory.unsafe;

import java.io.File;
import java.io.IOException;
import java.nio.ByteOrder;
import org.apache.pinot.segment.spi.memory.NonNativePinotDataBuffer;
import org.apache.pinot.segment.spi.memory.PinotBufferFactory;
import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
import xerial.larray.impl.OSInfo;


public class UnsafePinotBufferFactory implements PinotBufferFactory {
  public UnsafePinotBufferFactory() {
    if (OSInfo.isWindows()) {
      throw new IllegalStateException(getClass().getCanonicalName() + " cannot be used in Windows");
    }
  }

  @Override
  public PinotDataBuffer allocateDirect(long size, ByteOrder byteOrder) {
    UnsafePinotBuffer buffer = new UnsafePinotBuffer(new DirectMemory(size), true);
    if (byteOrder == ByteOrder.nativeOrder()) {
      return buffer;
    } else {
      return new NonNativePinotDataBuffer(buffer);
    }
  }

  @Override
  public PinotDataBuffer mapFile(File file, boolean readOnly, long offset, long size, ByteOrder byteOrder)
      throws IOException {
    UnsafePinotBuffer buffer = new UnsafePinotBuffer(new MmapMemory(file, readOnly, offset, size), true);
    if (byteOrder == ByteOrder.nativeOrder()) {
      return buffer;
    } else {
      return new NonNativePinotDataBuffer(buffer);
    }
  }
}
